Ore jigger



OCL 7, 1952 l. l.. PATTERSON 2,512,995

CRE JIGGER.

Filed sept. 19. 1949 Fin/7.5.

Patented Oct. 7, 1952 1 4 s. STATES PATENT i' can JIGda "Iaiiieslielattersoni Kuala iumper,

Selangor, Malaya.

` Application September 19, i949, :Serial No. II" In Great Britain Julyl8, 1948 A a 4v claims. w1; tes-4,253 This `inventier1 encensiipfevemetshinor une arene side of the screed for mtement Vin relatingvrto `jigs used for the treatment ofj minthe planerof or parallel withthescreen; the striker gral ores; pin being operated by one arm of adouble-armed of theweii-rwtypewhr finie' materiales '6 eusconstruction.. l i? Ofrl 5 "Grlidssse'd over a The screen isres'iliently supported forlshock SC eh :isivrhriaftef referred movement,as in a mounting or mountingsvof and is subjected to e iqmsatir'igupfrubber; Y, Y s; vement thereover'by` water currents l Two constructionsin accordance Vwith the prs; "sfo l 'a statication ofthe material 10ent-invention will nowibe 'described by Way of me' passage' ofv the `oreparticles through the example withv reference to the accompanying screento hiitch inthe jig. 'Iliwatercurrents drawings in which:u i y y o AFigure 1 is a diagrammatic cross'sectioniof one type of jiginwhichqwater currents' are impelled byarec'iprocet-toryplunger;andylM '1; Fig11`r.2 zs a @95S section or anotherityuel of jig-in whichHwaterdcurrents are impelledby -a mirzrc.euery;eiephraeln-4 i MIgikereferencs are used for similar partsv in the two figures.` ,l y v.y Y.

v ,iRe'ferring iirst to theyconstructionjshownz in Ijigu'eul, the jg'ispro "dedlwith'aushell, or box '-9 ,ditemi en@ Side plunger H mountedff?? Yeriial reiprocawrymeramente The plunger is Ichou1c1-edbyamconnecting rod lZZto driving e tric i331. mounted on ahorizontalvlshaft i4. ,denother side or the" jig, `afscreen l5 isvitted@12 ierfndbetiem grids! &.|1-, y. i

' d `grid assemblyw` `mountedloe-- ed .leiter rubber pads y. l 81S@Athat torete clean me sc're Ina" al clanin applied duv screens begintoibii m ing, and thisV lili` b worse, so that 'capacity i'sreducd. V yN "ccdiidiiflg t'i the'-i 15' 's'en't fitiiyin ijf""""f 30 thel abovetype-there isfp'iovided impact mechf' anism for automaticallyiriinzi-ritirigi'`during func'- tion'ine'ofltie jig an intermittent or acontinuous series of shock movements to the jig screen so as to obviateor reduce' blinding-'of the screen.

i The' impact mechanism may include the combination of a stepped rotarydriving cam' which; is rotated continuously, a rocking lever operated y.A L i equally nonby the cam; and ahermer device operated byl zromailyand' Vis'-miminier fqf'mkm'g lmovemgnt the Cam for imparting the' shockmovements `to 40 about a pivot 23.` `flre other armi'of tHe lever thescreen The shock` movements maybe"i imisgpositioned uiiudarotarystepillen' o progressively of th jig below the screen in adirection normal to the tinuous hammer blows on the top grid I6. Thisplane of the screen, the hammer being operatively 50 operation producesan oscillatory up-and-down coupled by a connecting rod to one arm of amovement of the screen within its resilient double-armed rocking lever,whose other arm is mounting I8. Shocks imparted to the screen atoperated by the cam. a plunger speed of 120 strokes a minute have Withanother construction the hammer device proved satisfactory.

comprises a striker pin slidably mounted in a 55 Referring now to Figure2 a pulsating iiow of me jig te whie'ntiie ivenueri'is apiaiid is .leverin @manner similar to that muitileprevi- Water is impelled through thescreen I5 by a diaphragm mounted for reciprocatory movement on ahorizontal shaft 26 within one of the several cells of the jig shell l0.At one side of the jig shell is a rotary stepped cam 24 fitted on ahorizontal shaft 21. This cam lies adjacent the tip of the shorter armof a double-armed rocking lever 22l carried by a pivot 2,3. A tensionspring 28 connects lthe end ofthe other lever arm to a Xed bracket' 29in such manner as to hold'the shorter arm resiliently in contact withthe cam periphery. In line with the path of movement of the upper leverarm is a striker pin 3U slidablyy fitted in a guide 3| at the side ofthe shell. At its inner end the striker pin is positioned to engage'vthe side of the lower screen grid I1.

The screen-and-grid assemblyissupportedon brackets 32.

Ihere is a resilient packing 33 bef tween the assembly and the walls ofthe shell for` permitting a resilient oscillatory movement' ofI thescreen within its own plane.

Onrocking of the lever, the upper arm imparts blows on the outer end ofthe striker pin, which in turn imparts hammer `blowsto the side of the`screen-and-grid assembly.` As a consequence,

this assembly is given oscillatory shock movements in itsown plane.during operation of the Among the advantages of the invention are:blinding of the screen apertures is reduced or obviated; cleaningof thescreenis effected automatically during operation ofthe jig, so that theeilicienty of the jig remains unimpaired throughout its operation; asaving of time, since the jigs do not require to beV taken out ofservice for cleaning, because cleaning is effected automatically duringoperationof the jig, savingv of manual labour; avoidance of thenecessity for skilled supervision of manual cleaning, and the prolongingof the life of the screen plates,because they do not require to bethreshed y The rigid grid members I6 and I1 together with theV screenconstitute 4 a frame or unit 'mounted for bodily movement with respecttothe support in the shelll.l In other words the frame or unit as a wholeis capable of a vmotion of translation relatively to the shelf'orfsupport The frame or unit is driven in one direction bythehammerblows and by reasongof the fact that the frame or unit is cradled inresilient packing or the like the original movement set up by the blowsresults in a vibratory motion of the unit incident to the alternatecompression and expansion of the packing at opposite sides or ends ofthe'unit. Thus two forcesI act on the unit and due to its unitarycharacter and its cradling in rubber the screen is vibrated as a wholewith Vall areas of the screen partaking equally of the vibratory -motionin contradistinction to vibratory movement locally impressed on a screenthat is 'so anchored Yas not to be capable of a floating vibratorymotion of translation.

This uniform movement of the grid-and-screen unit throughoutsubstantially its entire area vwill not only prevent clogging of thescreen but will also impart to the material being treated a uniformmovement throughout the entire mass or body of the material. Such actionon thevpart of the unit will not interfere with the proper `:under.waterarid is subjected by water-.currents to pulsating up-and-down movementsto elfect stratification of the ore, the provision of a stationaryshell, a screen, upper and lower grid members between which the screenis rigidly lclamped in a horizontal position within the shell,

upper and lower resilient rubber pads carried by the shell between whichthe screen-and-grid assembly is mounted for` oscillatory up-and-downmovement as a unit in the shell, and a hammer guided -.for verticalmovement centrally of the screen for imparting blows direct to the gridmembers to producevertical oscillatory Ashock 'movements to thescreen-and-grid, assembly.

2.V Ina jig, a unit comprising a screenand grid members rigidly securedtogether, a support von which said unithasl bodily movement oftranslation, a resilient cushion on said support and'positioned at oneside of said unit, a second resilient cushion on said supportandpositioned'atthe opposite side of said unit, and' hammer means to impartblows to said unit to drive it bodily in one direction against the firstresilient cushion, whereby the first cushion will be distorted rand willreact to drive the unit bodilyagainst the secondresilient cushion sothat said second cushion will be distorted and will react to drive theunit bodily back against the rst cushion toset up in the unit avibrating motion throughout substantially its entire area. ,I l

3. In a jig, a unit comprising a screen and grid members rigidly securedtogether, asupport on which said unit has bodily movement oftranslation, resilient means comprisingportionsl positioned at oppositesides of said unit, and means to impart blows to said unit to drive itbodily in one direction against one of said portions, each of saidportions adapted to be distorted by the impact of said unit thereagainstand to react to oscillate said unit between said portions and toeffectshock movements of said unit.

4. Apparatus as claimed in claim 3, wherein the hammer is mounted todirect blows to the side of the frame in adirection substantially withinthe plane of the screen. i

. IAN LESLIE PATTERSON.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS 2,027,375 Fraser Jan. 14, 1936

